S.C.A.R.S. (N64)

Cheetah car:
Enter "NRNNRR" as a password.

Cobra car:
Enter "TRTTLL" as a password.

Panther car:
Enter "YMSTTR" as a password.

Scorpion car:
Enter "SDSSRT" as a password.

All cars and cups:
Enter "GGWWOO" as a password

Unlock Crystal Cup in Grand Prix mode:
Enter "LGSSSX" as a password.

Unlock Diamond Cup in Grand Prix mode:
Enter "CRKKYY" as a password.

Unlock Zenith Cup in Grand Prix mode:
Enter "DZPKKK" as a password.

Master mode and all bonus cars:
Enter "PXPRTS" as a password.

Enable all codes:
Enter "WLLVDD" as a password. Alternately, press Left, Up, Right, Down, Z, R, Down, Left, Up, Right at the player selection screen.